题目内容
(2012?龙岗区模拟)脱式计算.
①4050-6300÷42
②5.04×6.5-2.76
③175×
+
×175
⑤13÷(
+
)×
⑥
×[
÷(
-
)].
①4050-6300÷42
②5.04×6.5-2.76
③175×
3 |
10 |
7 |
10 |
⑤13÷(
1 |
4 |
5 |
6 |
3 |
4 |
⑥
8 |
15 |
5 |
6 |
7 |
9 |
1 |
3 |
分析:本题据四则混合运算的运算法则计算即可.
解答:解:
(1)4050-6300÷42
=4050-6300÷7÷6,
=4050-150,
=3900;
(2)5.04×6.5-2.76
=32.76-2.76,
=30;
(3)175×
+
×175
=(
+
)×175,
=1×175,
=175;
(5)13÷(
+
)×
=13÷
×
,
=12×
,
=3;
(6)
×[
÷(
-
)]
=
×(
÷
),
=
×
,
=1;
(1)4050-6300÷42
=4050-6300÷7÷6,
=4050-150,
=3900;
(2)5.04×6.5-2.76
=32.76-2.76,
=30;
(3)175×
3 |
10 |
7 |
10 |
=(
3 |
10 |
7 |
10 |
=1×175,
=175;
(5)13÷(
1 |
4 |
5 |
6 |
3 |
4 |
=13÷
13 |
12 |
1 |
4 |
=12×
1 |
4 |
=3;
(6)
8 |
15 |
5 |
6 |
7 |
9 |
1 |
3 |
=
8 |
15 |
5 |
6 |
4 |
9 |
=
8 |
15 |
45 |
24 |
=1;
点评:完成本题要认真分析各组数据,看是否能进行简便计算.
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